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Perf improvement: httpsys-hostheader-mismatch

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65376 In dotnet/aspnetcore;

· pr-benchmarks opened on Feb 9, 2026

ApiExplorer doesn't propagate non-success Results types

area-mvcIncludes: MVC, Actions and Controllers, Localization, CORS, most templatesIncludes: MVC, Actions and Controllers, Localization, CORS, most templates

feature-openapi

Status: Open.

#65371 In dotnet/aspnetcore;

· klinki opened on Feb 9, 2026

Blazor Server: Download file without JS

area-blazorIncludes: Blazor, Razor ComponentsIncludes: Blazor, Razor Components

Status: Open.

#65370 In dotnet/aspnetcore;

· marioilitio opened on Feb 9, 2026

Blazor InteractiveWebAssembly with BFF

area-security

Needs: Attention 👋This issue needs the attention of a contributor, typically because the OP has provided an update.This issue needs the attention of a contributor, typically because the OP has provided an update.

Status: Open.

#65368 In dotnet/aspnetcore;

· Schoof-T opened on Feb 9, 2026

Perf improvement: antiforgery-generation, antiforgery-validation

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65361 In dotnet/aspnetcore;

· pr-benchmarks opened on Feb 8, 2026

Perf improvement: json_middleware

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65357 In dotnet/aspnetcore;

· pr-benchmarks opened on Feb 7, 2026

InvalidCastException when using [AsParameters] with primary constructor record that has ValidationAttribute on constructor parameters

area-minimalIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etcIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etc

feature-openapi

Status: Open.

#65348 In dotnet/aspnetcore;

· XmmShp opened on Feb 6, 2026

RequestDelegateGenerator enabled results in incorrect ApiParameterDescription.IsRequired for nullable array

area-minimalIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etcIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etc

feature-rdg

Status: Open.

#65344 In dotnet/aspnetcore;

· pgelardi-motor opened on Feb 6, 2026

[Blazor] Analyzer to warn about caching User instances without subscribing to changes

analyzerIndicates an issue which is related to analyzer experienceIndicates an issue which is related to analyzer experience

area-blazorIncludes: Blazor, Razor ComponentsIncludes: Blazor, Razor Components

Status: Open.

#65337 In dotnet/aspnetcore;

· javiercn opened on Feb 5, 2026

·  

Backlog

SignalR Core server KeepAliveInterval doesn't reset with messages

area-signalrIncludes: SignalR clients and serversIncludes: SignalR clients and servers

Status: Open.

#65336 In dotnet/aspnetcore;

· MarinAtanasov opened on Feb 5, 2026

Breaking change: PATCH no longer accepts Content-Type application/json

area-minimalIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etcIncludes minimal APIs, endpoint filters, parameter binding, request delegate generator etc

feature-json-patch

Status: Open.

#65325 In dotnet/aspnetcore;

· stevendarby opened on Feb 4, 2026

Healthcheck log message with redundant HealthCheckName (both in log message and in log scope)

area-healthchecksIncludes: Healthchecks (some bugs also in Extensions repo)Includes: Healthchecks (some bugs also in Extensions repo)

Status: Open.

#65323 In dotnet/aspnetcore;

· tomap opened on Feb 4, 2026